hw8 - Killough, Ian Homework 8 Due: Nov 14 2006, 4:00 pm...

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Unformatted text preview: Killough, Ian Homework 8 Due: Nov 14 2006, 4:00 pm Inst: Donna C Lyon 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. This HW assignment is due Tuesday, November 14, by 4:00PM. 001 (part 1 of 3) 10 points Make the following assumptions: 1) The density of liquid water at 100 C is 1.00 g/mL; 2) the vapor is adequately described by the ideal gas equation; 3) the external pressure is constant at 1.00 atm; and 4) the heat of vaporization of water is 2.26 kJ/g. What is q for the vaporization of 1.00 g of liquid water at 1.00 atm and 100 C, to the formation of 1.00 g of steam at 1.00 atm and 100 C? 1. q = 3 . 24 kJ 2. q = 0 . 126 kJ 3. q = 0 kJ 4. q = 1 . 67 kJ 5. q = 2 . 26 kJ correct Explanation: m = 1.00 g H vap . = 2.26 kJ/g q = 2 . 26 kJ g (1 g) = 2 . 26 kJ 002 (part 2 of 3) 10 points What is w for this process? 1. w =- 1 . 70 J 2. w =- 1 . 70 L atm correct 3. w = +1 . 70 L atm 4. w = +1 . 70 J Explanation: P = 1 atm T = 100 C + 273 = 373 K density = 1 g/mL W =- P V V i = (1 g) 1 mL 1 g 1 L 1000 mL = 0 . 001 L V f = n R T P = . 082058 L atm 1 mol K 373 K atm (1 g) 1 mol 18 g = 1 . 701 L w =- (1 atm)(1 . 701- . 001)L =- 1 . 70 L atm 003 (part 3 of 3) 10 points What is E for this process? 1. E = 2 . 43 kJ 2. E = 2 . 09 kJ correct 3. E = 0 . 56 kJ 4. E = 1 . 29 kJ Explanation: E = q + w = 2 . 26 kJ + - 1 . 70 L atm 101 . 33 J L atm 1 kJ 1000 J = 2 . 09 kJ 004 (part 1 of 1) 10 points Calculate the quantity of energy required to change 3.00 mol of liquid water at 100 C to steam at 100 C. The molar heat of vaporiza- tion of water is 40.6 kJ/mol. 1. 13.5 kJ 2. 40.6 kJ 3. 122 kJ correct Killough, Ian Homework 8 Due: Nov 14 2006, 4:00 pm Inst: Donna C Lyon 2 4. None of these 5. 300 kJ Explanation: n = 3.0 mol 40 . 6 kJ mol 3 mol = 121 . 8 kJ 005 (part 1 of 1) 10 points How much heat is required to vaporize 50.0 g of water if the initial temperature of the water is 25.0 C and the water is heated to its boiling point where it is converted to steam? The specific heat capacity of water is 4 . 18 J ( C)- 1 g- 1 and the standard en- thalpy of vaporization of water at its boiling point is 40 . 7 kJ mol- 1 ....
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This note was uploaded on 04/13/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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hw8 - Killough, Ian Homework 8 Due: Nov 14 2006, 4:00 pm...

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